Migration from Oracle 8i to Oracle 9

Hi all,

After migration of an Oracle database from version 8i to 9, I am not able 
anymore to access it either from eomodeler or from the application.
I have the following error :

Stack Trace:
JDBCAdaptorException: EvaluateExpression failed:
<OraclePlugIn$OracleExpression: "SELECT t0.UpdCode, t0.CODEBG,
t0.GENERICCODE, t0.GENERICGROUP, t0.GRDFRCODE, t0.GROUPCODE, t0.HSCODE,
t0.IHACODE, t0.swissmediccat, t0.SWISSMEDICKEY, t0.INSCODE, t0.INSCODELIM,
t0.LIMPKT, t0.LOACODE, t0.NUMOFPCE, t0.PACK, t0.PHAR, t0.PRODUCTKEY,
t0.SALECODE, t0.STOCKFRIDGE, t0.STOCKNARC, t0.STOCKTEMP, t0.STOCKTOX,
t0.TOXCLASS, t0.VATCODE, t0.WWW FROM GDAC t0">:
    Next exception:SQL State:60000 -- error code: 600 -- msg: ORA-00600:
internal error code, arguments: [ttcgcshnd-1], [0], [], [], [], [], [], []

 at JDBCContext._jdbcErrorWithChannel(Compiled Code)
 at JDBCChannel._evaluateExpression(JDBCChannel.java:304)
 at JDBCChannel.evaluateExpression(JDBCChannel.java:255)
 at JDBCChannel.selectAttributes(JDBCChannel.java:185)


Thank you in advance for any idea.

Pierre Gilquin